While Jennifer feels unstoppable at 46, she's annoyed by society's preoccupation with age. “Your age always has to be mentioned, and men don’t really get that for some reason," Aniston told WWD. "Women and men today in their 40s are so much healthier than they were 30 years ago. It was a different time."

Jennifer, a longtime workout fanatic, said people today are much more savvy about the anti-aging effects of a healthy diet and regular exercise.

"We know how to take care ourselves," said Aniston. "We know what to put in our bodies to fuel us that’s healthy and organic and not processed, and the importance of drinking water and cutting out sugars and bad fats. Before, we just didn’t know that, and we didn’t have the technology with skin care that we have today.”

Like other celebrities, Jennifer typically follows a low-carb diet, although she regularly splurges on her favorite cuisine: Mexican food.

Low-carb diets such as the ketogenic, Paleo and Atkins diets fuel rapid weight loss by forcing the body to burn fat for fuel, said obesity expert Dr. Eric Westman, co-author of Keto Clarity.

She maintains her age-defying beauty by following a low-carb diet and working out almost every day. Jennifer has been doing yoga for 20 years, saying the meditative practice tones her body and calms her mind. "If yoga didn't exist, I'd invent it," she said.

Aniston does yoga three days a week with her longtime friend and yoga teacher, Mandy Ingber. Mandy told me she and Jennifer combine cardio and toning exercises into their workouts.

"We incorporate cardio and toners into the yoga sessions, much like I do in my Yogalosophy DVD," said Ingber. "We meet up about three times a week, and our sessions are 60 to 90 minutes."

When asked what her weirdest beauty regimen was, Aniston laughs. "The closest I'll ever go is a Derma roller," she said. "Google it — it's great. It's like a little wheel that has little pins, like acupuncture needles in a way, and you roll it and it stimulates your collagen and it also allows for your products to seep into your skin."

Thanks to her lifetime dedication to health and fitness, Jennifer looks and feels incredible, and doesn't dread getting older. "I really try not to focus on it too much," said Aniston. "Society focuses on it way more than we need to."

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Samantha Chang is the co-owner of www.theimproper.com., an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha enjoys running, cycling and taking photos. Contact her at schang@theImproper.com.